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发明名称
Method of applying protector collars to drill pipes
摘要
申请公布号
US2497921(A)
申请公布日期
1950.02.21
申请号
US19470781931
申请日期
1947.10.24
申请人
BALLARD LESTER W
发明人
BALLARD LESTER W.
分类号
E21B17/12
主分类号
E21B17/12
代理机构
代理人
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